##LoginWindow.cs
public partial class LoginWindow : Window
    {
        public MainViewModel MainModel { get; set; }


##LoginWindow.xaml

     <TextBlock Height="104" Margin="12,12,12,0"  Name="LoginTextBlock" VerticalAlignment="Top" Text="You must be an Oracle administrator to use this tool. If you do not know the Oracle Admin user or password, STOP! If you have questions, call Centricity Support @ 1-800-957-6837" TextWrapping="Wrap" FontSize="14" />
        <TextBlock Height="30" Margin="91,122,91,0" Name="UsernameTextBlock" VerticalAlignment="Top" Text="Oracle Admin User:"></TextBlock>
    	<TextBlock Margin="91,0,91,128" Name="textBlock1" Text="Oracle Admin Password:" Height="30" VerticalAlignment="Bottom" />
        <TextBox Height="23" Margin="91,145,91,0" Name="UsernameTextBox" VerticalAlignment="Top" Text="{Binding _testString}" />


##MainViewModel
    public class MainViewModel : BaseViewModel
    {
        private BaseDbModel _database;
        public String _testString = "THIS IS A TEST STRING";